<script setup>
import { onMounted, ref } from 'vue'
import axios from 'axios'
import powerSet from './powerSet'
// 商品数据
const goods = ref({})
let pathMap = {}
const getGoods = async () => {
  // 1135076  初始化就有无库存的规格
  // 1369155859933827074 更新之后有无库存项（蓝色-20cm-中国）
  const res = await axios.get('http://pcapi-xiaotuxian-front-devtest.itheima.net/goods?id=1369155859933827074')
  goods.value = res.data.result
  pathMap = getPathMap(goods.value)
  console.log(pathMap);
  initDisabledStatus(goods.value.specs,pathMap)
  
}
onMounted(() => getGoods())
//切换选中状态
const changeSku = (item,val)=>{
    if(val.disabled)return
    if(val.selected){
        val.selected = false
    }else{
        item.values.forEach(val=>val.selected=false)
        val.selected = true
    }
    pathMap = getPathMap(goods.value)
    updateDisabledStatus(goods.value.specs,pathMap)
    //产出SKU对象数据
    const index = getSelectedValues(goods.value.specs).findIndex(item => item===undefined)
    if(index>-1){
        console.log('找到了，信息不完整');
        
    }else{
        console.log('没有找到，信息完整，可以产出');
        //获取SKU对象
        const key = getSelectedValues(goods.value.specs).join('-')
        const skuIds = pathMap[key]
        console.log(skuIds);
        //以skuId作为匹配项去goods.value.skus数组中找
        const skuObj = goods.value.skus.find(item=>item.id===skuIds[0])
        console.log(skuObj);
        
    }
}
//生成有效路径字典对象
const getPathMap = (goods)=>{
    const pathMap = {}
    //1.根据库存字段得到有效的Sku数组
    const effectiveSkus = goods.skus.filter(sku=>sku.inventory>0)
    //2.根据有效的Sku数组使用powerSet算法得到所有子集
    effectiveSkus.forEach(sku=>{
        //2.1获取匹配的valueName组成的数组
        const selectedValArr = sku.specs.map(val=>val.valueName)
        //2.2使用算法获取子集
        const valueArrPowerSet = powerSet(selectedValArr)
        //3.把得到子集生成最终的路径字典对象
        valueArrPowerSet.forEach(arr=>{
            //初始化key 数组join -> 字符串 对象的key
            const key = arr.join('-')
            //如果已经存在当前key了 就往数组中直接添加skuId 如果不存在key 直接做赋值
            if(pathMap[key]){
                pathMap[key].push(sku.id)
            }else{
                pathMap[key] = [sku.id]
            }
        })
    })
    //3.根据子集生成路径字典对象
    return pathMap
}
//初始化禁用状态
const initDisabledStatus = (specs,pathMap)=>{
    specs.forEach(spec=>{
        spec.values.forEach(val=>{
            if(pathMap[val.name]){
                val.disabled = false
            }else{
                val.disabled = true
            }
        })
    })
}
//获取选项中匹配数组
const getSelectedValues = (specs)=>{
    const arr = []
    specs.forEach(spec=>{
        const selectedVal = spec.values.find(item=>item.selected)
        arr.push(selectedVal?selectedVal.name:undefined)
    })
    return arr;
}
//切换时更新禁用状态
const updateDisabledStatus = (specs,pathMap)=>{
    specs.forEach((spec,index)=>{
        const selectedValues = getSelectedValues(specs)
        spec.values.forEach(val=>{
            selectedValues[index] = val.name
            const key = selectedValues.filter(value=>value).join('-')
            if(pathMap[key]){
                val.disabled = false
            }else{
                val.disabled = true
            }
        })
    })
}
</script>

<template>
  <div class="goods-sku">
    <dl v-for="item in goods.specs" :key="item.id">
      <dt>{{ item.name }}</dt>
      <dd>
        <template v-for="val in item.values" :key="val.name">
          <!-- 图片类型规格 -->
          <img v-if="val.picture" :src="val.picture" :title="val.name" @click="changeSku(item,val)" :class="{selected:val.selected,disabled:val.disabled}">
          <!-- 文字类型规格 -->
          <span v-else @click="changeSku(item,val)" :class="{selected:val.selected,disabled:val.disabled}">{{ val.name }}</span>
        </template>
      </dd>
    </dl>
  </div>
</template>

<style scoped lang="scss">
@mixin sku-state-mixin {
  border: 1px solid #e4e4e4;
  margin-right: 10px;
  cursor: pointer;

  &.selected {
    border-color: #27ba9b;
  }

  &.disabled {
    opacity: 0.6;
    border-style: dashed;
    cursor: not-allowed;
  }
}

.goods-sku {
  padding-left: 10px;
  padding-top: 20px;

  dl {
    display: flex;
    padding-bottom: 20px;
    align-items: center;

    dt {
      width: 50px;
      color: #999;
    }

    dd {
      flex: 1;
      color: #666;

      >img {
        width: 50px;
        height: 50px;
        margin-bottom: 4px;
        @include sku-state-mixin;
      }

      >span {
        display: inline-block;
        height: 30px;
        line-height: 28px;
        padding: 0 20px;
        margin-bottom: 4px;
        @include sku-state-mixin;
      }
    }
  }
}
</style>